fix: Correct `debugging_monitor.py` script instructions (#676)
## Summary
**What is the goal of this PR?**
- Minor correction to the `debugging_monitor.py` script instructions
**What changes are included?**
- `pyserial` should be installed, NOT `serial`, which is a [different
lib](https://pypi.org/project/serial/)
- Added macOS serial port
## Additional Context
- Just a minor docs update. I can confirm the debugging script is
working great on macOS
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